package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageBean;
import com.sky.service.DishService;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
@Slf4j
@AllArgsConstructor
public class DishServiceImpl implements DishService {
    private final DishMapper dishMapper;
    private final DishFlavorMapper dishFlavorMapper;
    private final SetmealDishMapper setmealDishMapper;

    /**
     * 添加菜品
     *
     * @param dishDTO 条件
     */
    @Override
    public void addDish(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.addDis(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if ( flavors != null && flavors.size() > 0 ) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }

    /**
     * 菜品分页查询
     *
     * @param pageQueryDTO 条件
     */
    @Override
    public PageBean PageQuery(DishPageQueryDTO pageQueryDTO) {
        PageHelper.startPage(pageQueryDTO.getPage(), pageQueryDTO.getPageSize());
        Page page = dishMapper.pageQuery(pageQueryDTO);
        return new PageBean(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     *
     * @param ids 主键
     */
    @Override
    public void deleteByIds(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for ( Long id : ids ) {
            Dish dish = dishMapper.getById(id);//后绪步骤实现
            if ( dish.getStatus() == StatusConstant.ENABLE ) {
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

            //判断当前菜品是否能够删除---是否被套餐关联了？？
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(id);
            if ( setmealIds != null && setmealIds.size() > 0 ) {
                //当前菜品被套餐关联了，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }

            //删除菜品表中的菜品数据
            dishMapper.deleteById(id);//后绪步骤实现
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);//后绪步骤实现
        }
    }

    /**
     * 根据id查询数据
     *
     * @param id 主键
     * @return Dish
     */
    @Override
    public Dish selectById(Integer id) {
        Dish dish = dishMapper.selectById(id);
        return dish;
    }

    /**
     * 根据分类id查询
     *
     * @param id 分类主键
     * @return Dish
     */
    @Override
    public Dish selectByCategory(Integer id) {
        Dish dish = dishMapper.selectByCategory(id);
        return dish;
    }

    /**
     * 修改菜品状态
     *
     * @param status 菜品状态
     * @param id     菜品主键
     */
    @Override
    public void updateStatus(Integer status, Integer id) {
        dishMapper.updateStatus(status, id);
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if ( flavors != null && flavors.size() > 0 ) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
}
